89 xr250r rear disc conversion

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I was wondering if anyone out there has done a rear disc conversion on an 89 xr, and if so how did they go about it, does anyone make a kit, or should i just start digging around for a junked out 90 model with the rear swing arm intact? Any suggestions are appreciated.

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I haven't done the same conversion but I'm in the middle of a rear disc conversion on a XR200R. The 90-95 swing arm, rear caliper, and rear wheel is a bolt on but you still need to build a bracket for the master cylinder and construct brake pedal linkage, or use a 90-95 brake pedal (hard to find).

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Ok thanks for the info guys that's kinda what I was thinking I would need to do. The fabrication won't be a problem a buddy of mine has a full service machine shop at his house, as far as parts, there isn't a whole lot of choices in my area, so looks like I'll be ebaying it up, I think this is turning into a winter project the more I think about it hahaha